Recommended for use on carpet and tracks with a high traction, the automobile rotates better and drives better through corners. Fits both XB4 & XB4 2WD. Aluminum rear reduced suspension system holders with incorporated Suspension Settings (I.S.S.) permits quick & easy suspension system geometry setting. This XRAY concept was first introduced into the 1st XB8 and now was carried to the 1/10 scale XB4. Making use of eccentric suspension bushings placed into aluminum suspension system blocks, along with extra suspension shims, the XB4 suspension system geometry could be entirely modified.